Ononot — Let Sn be the sum of the first n terms of an arithmetic sequ

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Arithmetic Sequenceshard

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Let $S_n$ be the sum of the first $n$ terms of an arithmetic sequence. If $S_{n} = n^2 + 3n$ and $S_{n-1} = n^2 - 1$ , find the $n^{th}$ term $a_n$ .